Cu4 Se8 Cl4

Cu₄Se₈Cl₄ is a mixed-halide copper selenide semiconductor compound combining copper, selenium, and chlorine in a layered structure. This is a research-stage material primarily explored for photovoltaic and optoelectronic applications rather than a mainstream industrial material; it belongs to the family of metal chalcohalides being investigated for next-generation solar cells, photodetectors, and light-emitting devices due to its tunable bandgap and layered crystallographic properties. Engineers consider such compounds as potential alternatives to lead halide perovskites and traditional CdTe/CIGS solar absorbers, offering the possibility of non-toxic, earth-abundant semiconductor devices, though stability and scalability remain active research challenges.